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Employee Benefit Plan - Net Periodic Pension Costs (Details) - Non-U.S. Plan
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
age
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Plan information      
Required rate of return under Belgian law, employer contributions 1.80%    
Required rate of return under Belgian law, employee contributions 1.80%    
Benefit rights vests upon statutory retirement age | age 62    
Net periodic pension costs      
Service cost (gross) $ 1,587 $ 1,549 $ 1,164
Interest cost 53 106 234
Expected return on plan assets (302) (271) (242)
Amortization of unrecognized actuarial gain (12) (40) (22)
Net periodic pension cost $ 1,326 $ 1,344 $ 1,134